Adult patient with possible seasonal influenza infection

Abrupt onset of systemic symptoms. Patient suddenly feels very ill, with fever, malaise and even dizziness.

Respiratory symptoms are both upper and lower, even mild dyspnea.

Incubation last 2 days. By day 4 there is sumptom onset. It may start to improve by day 5 and end by day 7 but it may take much longer, even up to 10-14 days.

You must suspect it during outbreak. Must be your first suspicion. Otherwise the possibility of flu is much lower. Then rhinovirus will be the most likely cause.

Older adults, patients with other comorbidities and immunocompromised patients will be at higher risk of longer diseas and complications.

Most important and frequent complication is pneumonia. This may be primary from flu or secondary from bacteria, most frequently from strept. Pneumoniae.

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